🛡️Domain Reputation CheckBlocklist, phishing & malware status→

`developonlinecourse.com`

DNSSEC	⚠️ Not signed
A	202.254.234.90^{🇯🇵 XSERVER-AS202.254.232.0/22 XSERVER Inc.}
		PTR	`sv3089.xserver.jp`
NS	`ns1.xserver.jp` ⭐
		A	202.226.36.164^{🇯🇵 XSERVER-AS202.226.36.0/22 XSERVER Inc.}
		A	202.226.36.170^{🇯🇵 XSERVER-AS202.226.36.0/22 XSERVER Inc.}
		A	202.226.36.246^{🇯🇵 XSERVER-AS202.226.36.0/22 XSERVER Inc.}
NS	`ns2.xserver.jp`
		A	35.72.43.26^{🇯🇵 Amazon35.72.0.0/13 EC2 NRT prefix}
NS	`ns3.xserver.jp`
		A	202.226.36.247^{🇯🇵 XSERVER-AS202.226.36.0/22 XSERVER Inc.}
NS	`ns4.xserver.jp`
		A	183.90.224.226^{🇯🇵 XSERVER-AS183.90.224.0/20 XSERVER Inc.}
		A	183.90.224.230^{🇯🇵 XSERVER-AS183.90.224.0/20 XSERVER Inc.}
		A	202.226.39.247^{🇯🇵 XSERVER-AS202.226.36.0/22 XSERVER Inc.}
NS	`ns5.xserver.jp`
		A	157.112.182.218^{🇯🇵 XSERVER-AS157.112.176.0/21 XSERVER Inc.}
		A	157.112.182.220^{🇯🇵 XSERVER-AS157.112.176.0/21 XSERVER Inc.}
		A	202.226.37.247^{🇯🇵 XSERVER-AS202.226.36.0/22 XSERVER Inc.}
MX	`developonlinecourse.com` ⭐
		A	202.254.234.90^{🇯🇵 XSERVER-AS202.254.232.0/22 XSERVER Inc.}
			PTR	`sv3089.xserver.jp`
TXT	`v=spf1 +a:sv3089.xserver.jp +a:developonlinecourse.com +mx include:spf.sender...`
SOA	`ns1.xserver.jp`root@xserver.jp serial=0

`com`

	DNSSEC	🔒 Signed (DS record present)
	NS	`a.gtld-servers.net` ⭐
	NS	`b.gtld-servers.net`
	NS	`c.gtld-servers.net`
	NS	`d.gtld-servers.net`
	NS	`e.gtld-servers.net`
	NS	`f.gtld-servers.net`
	NS	`g.gtld-servers.net`
	NS	`h.gtld-servers.net`
	NS	`i.gtld-servers.net`
	NS	`j.gtld-servers.net`
	NS	`k.gtld-servers.net`
	NS	`l.gtld-servers.net`
	NS	`m.gtld-servers.net`
	SOA	`a.gtld-servers.net`nstld@verisign-grs.com serial=1794237561

MX for

developonlinecourse.com

Same first word

developonlinecourse.com

Previous names

Next names

DNS History

7 records (7 active, 0 former)

●NSns1.xserver.jp2019-12-17 → 2026-11-09 · 2 obs

● 2019-12-17 15:42:08
● 2026-11-09 15:35:04

●NSns2.xserver.jp2019-12-17 → 2026-11-09 · 2 obs

● 2019-12-17 15:42:08
● 2026-11-09 15:35:04

●NSns3.xserver.jp2019-12-17 → 2026-11-09 · 2 obs

● 2019-12-17 15:42:08
● 2026-11-09 15:35:04

●NSns4.xserver.jp2019-12-17 → 2026-11-09 · 2 obs

● 2019-12-17 15:42:08
● 2026-11-09 15:35:04

●NSns5.xserver.jp2019-12-17 → 2026-11-09 · 2 obs

● 2019-12-17 15:42:08
● 2026-11-09 15:35:04

●MXdeveloponlinecourse.com2019-12-17 → 2026-11-09 · 2 obs

● 2019-12-17 15:42:08
● 2026-11-09 15:35:04

●A202.254.234.902019-12-17 → 2026-11-09 · 2 obs

● 2019-12-17 15:42:08
● 2026-11-09 15:35:04

🔍 DNS Trace

📋 Delegation Chain

Zone	Nameservers	Glue
com	a.gtld-servers.net, b.gtld-servers.net, c.gtld-servers.net, d.gtld-servers.net...	-
developonlinecourse.com	ns1.xserver.jp, ns2.xserver.jp, ns3.xserver.jp, ns4.xserver.jp...	-

✅ Authoritative Response

Server:202.226.39.247

NS records: ns1.xserver.jp, ns2.xserver.jp, ns3.xserver.jp, ns4.xserver.jp, ns5.xserver.jp

🔒 DNSSEC Status

⚠️ Insecure (no DNSSEC)

No DS record for developonlinecourse.com (unsigned zone)

⏱️ Timing

Total: 3273ms | Queries: -

📄 Records

Type	Count	Sample Data
A	1	`202.254.234.90`
NS	5	`ns3.xserver.jp, ns1.xserver.jp...`
MX	1	`developonlinecourse.com (pri: 0)`
TXT	1	`v=spf1 +a:sv3089.xserver.jp +a:developon`
SOA	1	`ns1.xserver.jp root.xserver.jp`

Analysis

Mail Server Role

developonlinecourse.com is listed as a mail server for itself.

IP Addresses

developonlinecourse.com resolves to one IP address: 202.254.234.90.

mail.sakai-da.or.jp, rqe.or.jp, al-living.net and two other host names share IP numbers with developonlinecourse.com.

Name Servers

developonlinecourse.com has five name servers, which are ns1.xserver.jp, ns2.xserver.jp, ns3.xserver.jp and two others.

At least some of developonlinecourse.com's name servers are shared with other domains, for example mieflute.com, ginza-kobanzame.com, yuyado.com and two more.

These name servers tend to be deployed in combination with the name servers ns5.xserver.jp and ns4.xserver.jp.

Hostnames that resolve to three IP addresses:

ns1.xserver.jp has IP addresses 202.226.36.164, 202.226.36.170 and 202.226.36.246.

ns4.xserver.jp has IP addresses 183.90.224.226, 183.90.224.230 and 202.226.39.247.

ns5.xserver.jp has IP addresses 157.112.182.218, 157.112.182.220 and 202.226.37.247.

Hosts with just one IP address:

ns2.xserver.jp directs to 35.72.43.26.

ns3.xserver.jp directs to 202.226.36.247.

Mail Servers

Mail for developonlinecourse.com is handled by one mail server — developonlinecourse.com.

developonlinecourse.com has exactly one IP number: 202.254.234.90.

developonlinecourse.com - robtex.com